Clinical ProtocolsClinical Trials as TopicResearch DesignClinical Trials, Phase IV as TopicTreatment OutcomeRandomized Controlled Trials as TopicMulticenter Studies as TopicPatient SelectionSingle-Blind MethodCost-Benefit AnalysisSample SizeExercise TherapyAcupuncture TherapyTime FactorsOutcome Assessment (Health Care)Quality of LifeClinical Trials, Phase III as TopicQuestionnairesClinical Trials, Phase II as TopicPatient Education as TopicProspective StudiesFollow-Up StudiesGreat BritainClinical Trials, Phase I as TopicDisability EvaluationDouble-Blind MethodControlled Clinical Trials as TopicEnglandPrimary Health Care